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PLEASE show all your work Question 4: A company medical director failed to find significant evidence...

PLEASE show all your work

Question 4: A company medical director failed to find significant evidence that the mean blood pressure of a population of executives differed from the national mean μ = 128. The medical director now wonders if the test used would detect an important difference if one were present. For a random sample of size 72 from a normal population of executive blood pressures with standard deviation σ = 15, the z statistic is


z = (x ̄ − 128)/(15/ 72)

The two-sided test rejects

H0 :μ=128 at the 5% level of significance when |z| ≥ 1.96.

  1. (a) . Find the power of the test against the alternative μ = 135.

  2. (b) . Find the power of the test against μ = 121. Can the test

    be relied on to detect a mean that differs from 128 by 7?

  3. (c) (1 mark). If the alternative were farther from H0, say μ = 138, would the power be higher or lower than the values calculated in (a) and (b)?

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